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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 9 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Cash flows from operating activities:    
Net loss $ (246,989) $ (435,534)
Adjustment for income from discontinued operations (10,936) (212)
Loss from continuing operations (257,925) (435,746)
Adjustments to reconcile net loss to net cash provided by operating activities:    
Depreciation and amortization 317,771 372,298
Asset impairment charge 56,414 563,234
Amortization of debt discount and debt issuance costs 994 1,358
Provision for credit loss 8 4,151
Stock-based compensation 21,240 32,059
(Gain) loss on investment securities (7,853) 7,325
(Gain) loss on sale of assets 2,745 (18,790)
Gain on sale of subsidiary 0 (14,963)
Deferred income tax benefit (66,102) (122,366)
Other 8,849 (1,580)
Change in assets and liabilities:    
Accounts receivable (33,075) 189,280
Inventories of materials and supplies 14,073 568
Prepaid expenses and other (1,638) 3,051
Other noncurrent assets (3,337) 5,343
Accounts payable 24,908 (16,170)
Accrued liabilities 8,643 (118,178)
Other noncurrent liabilities 4,147 (4,583)
Net cash provided by operating activities from continuing operations 89,862 446,291
Net cash used in operating activities from discontinued operations (41) (38)
Net cash provided by operating activities 89,821 446,253
Cash flows from investing activities:    
Capital expenditures (49,173) (120,960)
Purchase of investments (236,784) (78,303)
Proceeds from sale of investments 139,430 66,033
Proceeds from sale of subsidiary 0 15,056
Proceeds from asset sales 26,775 31,200
Other 0 (50)
Net cash used in investing activities (119,752) (87,024)
Cash flows from financing activities:    
Dividends paid (81,815) (233,124)
Proceeds from stock option exercises 0 4,100
Payments for employee taxes on net settlement of equity awards (2,160) (3,752)
Payment of contingent consideration from acquisition of business (250) (4,250)
Share repurchases 0 (28,504)
Other (719) (446)
Net cash used in financing activities (84,944) (265,976)
Net increase (decrease) in cash and cash equivalents and restricted cash (114,875) 93,253
Cash and cash equivalents and restricted cash, beginning of period 536,747 382,971
Cash and cash equivalents and restricted cash, end of period 421,872 476,224
Cash paid during the period:    
Interest paid 11,642 11,511
Income tax paid (received), net (31,826) 43,629
Payments for operating leases 13,353 13,945
Non-cash operating and investing activities:    
Changes in accounts payable and accrued liabilities related to purchases of property, plant and equipment (746) 2,251
Changes in accounts receivable, property, plant and equipment and other noncurrent assets related to the sale of equipment 9,290 0
Cumulative effect adjustment for adoption of ASU No. 2016-13 $ (1,251) $ 0